Rice thanks supporters

12/13/12 9:15 PM EST

U.N. Ambassador Susan Rice, after weeks of remaining relatively silent in public about the controversy that surrounded her possible nomination as Secretary of State, let it rip on Thursday.

After writing a letter explaining her withdrawal to President Obama, she penned an op-ed blaming manufactured charges and then took to Twitter to address her followers.

"Those of you who know me know that I'm a fighter, but not at the cost of what's right for our country," she tweeted.

"I don't do this work for me. I do it because I believe in President Obama's approach to the world, and I want to get things done," Rice continued. "To all my followers: I appreciate you. We've still got a lot of work to do for the American people and the world. #Letsgo."